Sounds like an interesting idea. The obvious reason for doing it with papers is that if it doesn't work out or if you haven't got the right combination, you can get another chance. Also, because film has a wider tonal range than paper, it's not usually as much of an issue, but heck, why not try it?(posted 8601 days ago)If you are using sheet film and have a difficult lighting situation, you could try taking 4 identical exposures and trying out your split development strategy. It's not unusual among LF photographers to shoot 2 sheets of a scene, holding one in reserve in case the initial processing strategy is less than optimal.